ATE48279T1 - CONTINUOUS PROCESS FOR CHANGING THE MOLECULAR WEIGHT OF LINEAR OR CYCLIC ORGANO(POLY)SILOXANES. - Google Patents

CONTINUOUS PROCESS FOR CHANGING THE MOLECULAR WEIGHT OF LINEAR OR CYCLIC ORGANO(POLY)SILOXANES.

Info

Publication number
ATE48279T1
ATE48279T1 AT86103670T AT86103670T ATE48279T1 AT E48279 T1 ATE48279 T1 AT E48279T1 AT 86103670 T AT86103670 T AT 86103670T AT 86103670 T AT86103670 T AT 86103670T AT E48279 T1 ATE48279 T1 AT E48279T1
Authority
AT
Austria
Prior art keywords
poly
molecular weight
siloxanes
linear
continuous process
Prior art date
Application number
AT86103670T
Other languages
German (de)
Inventor
Manfred Dr Dipl-Chem Riederer
Original Assignee
Wacker Chemie Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wacker Chemie Gmbh filed Critical Wacker Chemie Gmbh
Application granted granted Critical
Publication of ATE48279T1 publication Critical patent/ATE48279T1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/0834—Compounds having one or more O-Si linkage
    • C07F7/0838—Compounds with one or more Si-O-Si sequences
    • C07F7/0872—Preparation and treatment thereof
    • C07F7/0874—Reactions involving a bond of the Si-O-Si linkage
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/21—Cyclic compounds having at least one ring containing silicon, but no carbon in the ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/06—Preparatory processes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Silicon Polymers (AREA)

Abstract

1. Continuous process for modifying the molecular weight of linear or cyclic organo(poly)siloxanes by means of a catalyst which is solid in the reaction mixture, at least at the particular reaction temperature, characterized in that the catalyst which is solid in the reaction mixture, at least at the particular reaction temperature, and the organo(poly)siloxane whose molecular weight is to be modified are passed continuously and simultaneously through a heated cylindrical reactor whose contents are mechanically agitated, this reactor having a length : internal diameter ratio of from 1:1 to 20:1 and in its interior being held at a pressure of from 50 to 500 hPa (abs), and the mixture obtained in this way is freed from catalyst after emergence from the reactor.
AT86103670T 1986-03-18 1986-03-18 CONTINUOUS PROCESS FOR CHANGING THE MOLECULAR WEIGHT OF LINEAR OR CYCLIC ORGANO(POLY)SILOXANES. ATE48279T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86103670A EP0237597B1 (en) 1986-03-18 1986-03-18 Continuous process for modifying the molecular weight of linear or cyclic organopolysiloxanes

Publications (1)

Publication Number Publication Date
ATE48279T1 true ATE48279T1 (en) 1989-12-15

Family

ID=8194977

Family Applications (1)

Application Number Title Priority Date Filing Date
AT86103670T ATE48279T1 (en) 1986-03-18 1986-03-18 CONTINUOUS PROCESS FOR CHANGING THE MOLECULAR WEIGHT OF LINEAR OR CYCLIC ORGANO(POLY)SILOXANES.

Country Status (3)

Country Link
EP (1) EP0237597B1 (en)
AT (1) ATE48279T1 (en)
DE (1) DE3667178D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831174A (en) * 1987-12-31 1989-05-16 Dow Corning Corporation Production of polydiorganosiloxane fluids with low silanol content
DE4441057C2 (en) * 1994-11-17 1999-02-25 Wacker Chemie Gmbh Process for the continuous production of organopolysiloxanes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460805A (en) * 1945-12-06 1949-02-08 Dow Chemical Co Polymerization of organo-polysiloxanes with acid-activated bleaching earth
FR1159254A (en) * 1955-09-13 1958-06-25 Thomson Houston Comp Francaise Apparatus for the continuous polymerization of organopolysiloxanes
US3903047A (en) * 1973-10-23 1975-09-02 Gen Electric Process for the production of silanol-stopped diorgano-polysiloxanes
US4222952A (en) * 1979-06-25 1980-09-16 Union Carbide Corporation Siloxane bond rearrangement effected by solid perfluorinated polymers containing pendant sulfonic acid groups
DE2951801A1 (en) * 1979-12-21 1981-07-02 Bayer Ag, 5090 Leverkusen METHOD FOR PRODUCING AEQUILIBRATION PRODUCTS OF ORGANOSILOXANS
FR2505850B1 (en) * 1981-05-12 1985-06-21 Rhone Poulenc Spec Chim PROCESS FOR OBTAINING POLYSILOXANES FROM HIGH MOLECULAR MASSES BY POLYMERIZATION AND REARRANGEMENT OF POLYSILOXANES IN THE PRESENCE OF A CATALYST CONSISTING OF A POROUS MINERAL SUPPORT COATED WITH A POLYMERIC FILM CARRIER OF SULFONIC OR PHOSPHONIC GROUPING

Also Published As

Publication number Publication date
DE3667178D1 (en) 1990-01-04
EP0237597A1 (en) 1987-09-23
EP0237597B1 (en) 1989-11-29

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